Composting Toilet? We installed one in our 1959
Tradewind as I didn't want to deal with a black tank and it's limitations as far as capacity. So we went with the Airhead and it has worked well, just make sure you put the fan in correctly so that it blows out of the AS instead of into, not an experience you want. Thankfully it was just the first couple days of use.
We also put in updated plumbing (no more cast iron) and two 16gl grey tanks within the frame and I'll post some pictures of that. We also put in a 31gl fresh water tank under the gaucho. Of course we did a ground up restoration/update which made it a little simpler.